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X-Ray Diffraction Study of the Phase Transition of the${\rm Si}(111)(\sqrt{3} \times \sqrt{3})\mbox{-Ag}$Surface

Author

Listed:
  • Toshio Takahashi

    (Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan)

  • Hiroo Tajiri

    (Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan)

  • Kazushi Sumitani

    (Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan)

  • Koichi Akimoto

    (Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan)

  • Hiroshi Sugiyama

    (Institute of Materials Structure Science, KEK, Oho, Tsukuba 305-0801, Japan)

  • Xiaowei Zhang

    (Institute of Materials Structure Science, KEK, Oho, Tsukuba 305-0801, Japan)

  • Hiroshi Kawata

    (Institute of Materials Structure Science, KEK, Oho, Tsukuba 305-0801, Japan)

Abstract

The structure of the${\rm Si}(111)(\sqrt{3} \times \sqrt{3})\mbox{-Ag}$surface was studied at both room temperature and a low temperature of 50 K using grazing incidence X-ray diffraction. At low temperatures diffuse scattering was observed in addition to Bragg reflection. Least squares analyses for Bragg reflections using anisotropic Debye–Waller factors show that the structure at 50 K is consistent with an inequivalent triangle (IET) model, while the structure at room temperature is explained by a honeycomb-chained triangle (HCT) model with strong anisotropic Debye–Waller factors. From the temperature dependence of diffuse scattering, the phase transition temperatureTcand critical exponent β were determined to be about 150 K and 0.27. Some Bragg intensities showed discontinuous changes in their first derivatives atTc. The results favor a displacive phase transition rather than an order–disorder one.

Suggested Citation

  • Toshio Takahashi & Hiroo Tajiri & Kazushi Sumitani & Koichi Akimoto & Hiroshi Sugiyama & Xiaowei Zhang & Hiroshi Kawata, 2003. "X-Ray Diffraction Study of the Phase Transition of the${\rm Si}(111)(\sqrt{3} \times \sqrt{3})\mbox{-Ag}$Surface," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 10(02n03), pages 519-524.
    • Handle: RePEc:wsi:srlxxx:v:10:y:2003:i:02n03:n:s0218625x03005050
    DOI: 10.1142/S0218625X03005050
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